In this video, Todd Lammle shows you his simple method to subnetting by using what he calls block sizes. Spend some time going through the examples, and follow up by reading his book to really build a strong foundation.
- [Narrator] Let's take a look at an example…using those blocks sizes we just discussed.…If I have a class C here, 192.168.10 is my…class C network address, I'm going to…start subnetting in the fourth octet.…My first subnet is 128, really my binary which…is important but I only have one bit on at an eight.…And the fact is that, that value is 128.…255.255.255.128.…So I take 256 minus 128, it gives me a block size of 128.…
I count in increments of that block size starting at zero.…Remember where the IP subnet zero.…Zero and zero plus 128 is 128.…128 plus 128, so I just keep counting in…that increment, it actually equals 256 which I…can't use that subnet obviously.…So this is my subnet, my first one is zero.…My next subnet is 128.…And if we look, I have one subnet bit,…and two to one equals two subnets.…I have seven host bits left, so two to the…seventh is 128 minus two because for the…network and broadcast address which I can't…use gives me 126 host, two subnets, 126 host.…
Now, how do I get my broadcast address…and why is that important?…
For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- The TCP/IP networking model
- Easy subnetting
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Network address translation
Skill Level Intermediate
Internetworking devices4m 20s
3. Introduction to TCP/IP
4. Easy Subnetting
5. VLSM, Summarization, and Troubleshooting TCP/IP
6. Cisco Internetworking Operating System (IOS)
7. Managing a Cisco Internetwork
8. IP Routing
9. Layer 2 Switching
10. VLANs and InterVLAN Routing (IVR)
12. Network Address Translation (NAT)
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